Persistent Map Vote Tallies (#86788)

## About The Pull Request

Changes map votes to be based on a persistent tally count.
Tallies for maps are cached between rounds and are added to by map
votes.
When a map is chosen, and it wasn't the only valid one, the tallies for
said chosen map will be reset.

Refactors map vote handling and moves it from SSmapping to SSmap_vote.
Rock the Vote has been removed as a result of this refactor.

## Why It's Good For The Game

Makes it more likely that all maps will be played over the course of a
server instead of always being truly random.
Removes some clutter off of SSmapping.

🆑
refactor: Map Votes are now carried over between rounds. When a map vote
is actually a contest, the winning map will have its votes reset.
/🆑

code/modules/unit_tests/unit_test.dm

@@ -158,7 +158,7 @@ GLOBAL_VAR_INIT(focused_tests, focused_tests())
 
 /// Logs a test message. Will use GitHub action syntax found at https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions
 /datum/unit_test/proc/log_for_test(text, priority, file, line)
-	var/map_name = SSmapping.config.map_name
+	var/map_name = SSmapping.current_map.map_name
 
 	// Need to escape the text to properly support newlines.
 	var/annotation_text = replacetext(text, "%", "%25")
@@ -177,14 +177,14 @@ GLOBAL_VAR_INIT(focused_tests, focused_tests())
 
 	GLOB.current_test = test
 	var/duration = REALTIMEOFDAY
-	var/skip_test = (test_path in SSmapping.config.skipped_tests)
+	var/skip_test = (test_path in SSmapping.current_map.skipped_tests)
 	var/test_output_desc = "[test_path]"
 	var/message = ""
 
 	log_world("::group::[test_path]")
 
 	if(skip_test)
-		log_world("[TEST_OUTPUT_YELLOW("SKIPPED")] Skipped run on map [SSmapping.config.map_name].")
+		log_world("[TEST_OUTPUT_YELLOW("SKIPPED")] Skipped run on map [SSmapping.current_map.map_name].")
 
 	else